Brake shoe



R. B. POGUE BRAKE SHOE Oct. 18, 1932.

Filed Nov 13, 1929 Patented Oct. 18, 1932 UNITED' sTATEs PATENT. OFFICE ROBERT B. POGUE, OF CHICAGO, ILLINOIS, ASSIGNOR T0 THE AMERICAN BRAKE SHOE 86 FOUNDRY COMPANY, OF WILMI/NGTON, DELAWABE, A CORPORATION OF DELAWABE BBAKE SHOE Application med November 18, 1929. sum 1h. 408.817.

This invention relates to brake shoes of that type which are provided witha reinforcing backplate and with an attachlng lug located midway between the ends of the shoe.

The object of the invention is to provide the shoe with a strong and substantial additional lug to bear on the brake head and cooperate with the attaching lug in sustainmg the weight of the shoe on the head.

A further object of the invention is to reinforce and strengthen the additional lug by metal of the body so that it will Withstand the shocks and jars to which brake shoes are customarily subjected in handling and in service.

In the accompanying drawing I have illustrated the invention in a simple embodiment and referringthereto,

Fig. l is a back plan view of the shoe.

Fig. 2 is a side view.

F Fig. 3 is a sectional view on the line 3-3 of Jig. 2.

Fig. 4 is a sectional view on the line 4-4 of Fig. 2.

Fig. 5 is a perspective view of the back plate.

Referring to the drawing 6 is the metal body of the shoe and 7 is a back plate which is embedded in the body at the back thereof. This back plate is provided in its side edges with recesses 8 midway between the ends of the plate and with recesses 9 between the middle of the plate and one end thereof. The back plate also has an opening 10 between the recesses 9 and the adjacent edge of the plate and with an elongated slot 11 in the other end portion of the plate, this slot extending from near the end of the plate to near the middle of the plate. The additional 111g, Fig. 3, is formed by a metal Strap 12 which is bent to substantia'lly rectangular form with its sides passing through the recesses 9 and its ends 18 bent under the plate 7 to anchor the strap to the plate and to the body of the shoe. The recesses 9 permit a suflicient quantity of body metal to flow during the casting operation alougside of the strap 12 to form projections 14. The tops of these projections are substantially flush with the top of the Strap and the projections reinforce and proteot the Strap against blows in handling and in service. The projections extend beyond the edges of the legs 15 of the Strap to contact w1th lugs on the head and prevent the Strap from contacting therewith which would produce undesirable wear. The body metal 1s permitted to flow up on top of the back and within the strap at 16 to provide a bearing for the key by which the shoe is fastened to the head and to confine the key in the lug. The attaching lug, F ig. 4, is also made with a Strap 17 reinforced by projections 18 of body metal. The additional lug, Fig. 3, cooperates with the attaching lug, F ig. 4, in sustaining the weight of the shoe on the head and shares with the attaching lug the wear which the attaching lug would otherwise sutfer alone by reason of its bearing on the head. The additional lug also shares with the attaching lug the wear on the head and protects the head from excessive wear at one bearing surface. The additional lug also provides a further connection between the shoe and the head which tends to hold the shoe fixedly in position on the head. The construction of the back is important because it provides a substantial anchorage to the body of a shoe having the two back lugs and the recesses provide for a substantial integral connection with the body so that they will not easily be broken in handling or in service.

I have shown the invention in a simple embodiment of a solid cast iron shoe but it will be understood that it can be applied to shoes with inserts or to shells for composition shoes and to other kinds of brake shoes, and that changes in the particular adaptation of the invention may be made to adaptfit to different shoes, Within the Scope of the following claim.

I claim A brake shoe comprising a body, a reenforce plate embedded in the body at the back thereof and having its side edges recessed at the middle of the plate and between the middle of the plate and one end thereof, an attaching lugcomprising a Strap engaging the recesses in the plate at the middle thereof, an additional lug comprising a strap engaging the other recesses in the plate, body metal forming projections alongside said straps, the attaching 111g having its opening clear of body metal and said projections extending above the Strap, and the additional 111g having body metal in its openin upon the reenforce back to form a bearing or the fastening key and the projections at the Vsides of its Strap terminating substantially flush with the top of the strnp.

ROBERT B. POGUE. 

